Hi Manal,
The bone deformation is caused by expansion of the bone marrow. I would suggest that the other child's bone marrow has to work harder to keep that Hb level, than your son's does. The designation of intermedia can be very subjective and almost arbitrary and using that diagnosis by Hb level alone may be a mistake. Bone deformation can be prevented by transfusion and it may mean that child should be transfusing. For this to be apparent at age 2, it does seem that the child has more characteristics of major than intermedia and probably should be transfused before more deformation takes place. However, doctors treat intermedia very differently from place to place, so the child's doctor may not agree.
If it is available, a bone density scan would give a more accurate view of the condition of your son's bones. In addition to the possibility of bleeding, contact sports can pose a danger to thals who do not have strong bones. Some thals are able to play contact sports but often, the bones are more brittle than normal and break easily and heal slowly. The bleeding is usually related to low platelets and/or a vitamin C deficiency, which is often a problem in thals as they should only take small amounts of C because high levels release too much iron at one time into the blood where it can clump in the heart and weaken heart function. Thalassemia causes much stress on the body which lead to deficiencies of many vitamins, such as E, C and folic acid. But since thals can't use high amounts of C they will sometimes suffer from deficiency which can't easily be corrected without posing some danger to the heart. Vitamin C deficiency can be seen first in how easily a person bruises. Because of the deficiency, the capillary walls are weak and break easily, leading to bruising. This, along with the low platelet levels that care sometimes seen in thals, are both possible factors in bleeding under the skin.